Paper-making machine



Feb. 25, 19,30. QOFRIN 1,748,062

' PAPER MAKING MACHINE Filed July 14/ 1927 2 Sheets-Sheet 1 Awfz'nEUafn'n Feb. 25, 1930. A. E. COFRINH v PAPER MAKING MACHINE Filed July14, 1927 2 Sheets-Sheet 2 LII 1 L hT 50 applied .to the machine,

Patented Feb. 25,-1930 UNITED STATES PATENT OFFICE AUSTIN E. COFRIN, FGREEK BAY, WISCONSIN PAPER-MAKING monmn Application filed July H, 1927.erial No. 205, 814.

The invention relates topapermaking machines of the Fourdrinier type andhas as an object the provision of improved means to remove the waterfrom the pulp upon the travelingwire.-

A further object of the invention is the provision of means to removewater from the pulp upon the wire with less disturbance of much higherrate ofspeed than those used at present, when making the same class ofpaper. i

. A further object of the invention is the provision of means of thecharacter described whereby the action of centrifugal force upon waterupon the surface of the tube'rolls tending to throw the water backthrough the wire with consequent disturbanceof the forming sheetupon thewire is avoided.

' A further object of the invention is the provision of a wire runningat a speed such-as to introduce the element of centrifugal force if usedwith normal smooth surfaced tube rolls and the use with wire run at suchspeeds ofa tube roll which is of a foraminous charreferred to isavoided.

It is a further object of the invention to provide hollow tube rollshaving perforated wire. A

Further objects will appear from the fol- 4 lowing description when readin connection with the accompanying drawingsshowing an illustrativeembodiment of the invention, wherein Figure 1 is a diagrammatical sideeleva tion, partly in section, showing the device acter wherebytheeffect of centrifugal force gal force upon the forming sheet upontheother portions thereof,

Fig. 2 is a plan view diagrammatical in character,

Figs-3 and lare detail side elevations of modifications of roll and bararrangements, and

Fig.'5 is a detail elevation partly broken away of one end of "aforaminous roll and its support. e

As shown, the machine embodies a Fourdrinier wire 10, a breast roll 11,couch rolls 12, and-1e, a slice bar '14, and an apron 15 of the usualtype. Suction boxes 16 and 17 are also shown.

One form of the mechanism provided by the present invention is shown ingeneral at 18 and comprises means for positively revolving some of thetube rolls at speed at variance with the speed of the Wire, also meansfor selectively placing into use the positively operated rolls or'theidle rolls, or a combination of the two.

I have found t hatthe usual tube rolls'of' the nature shown at 19, whichare usually allowed to act asidlers in sup ort of the wire, being drivenby friction with the wire in the same direction as the travel ofthe-wire, cause the water which travels with the wire, va a film uponits lower surface, to be forced'upwardly by centrifugal force throughthe Wire against the layer of stuff carried thereby, so

as to cause a disturbance ofithe' stuff and to I delayits feltingaction. v b y In the usual practice, the water is found to be removedfrom the wire after passage of the Wire over the tube roll underconsideration rather than before the wire passes over the same, thesurface friction of the water in'contact with the roll, and the motionof the roll in the direction of the travel of the wire, causing theaction referred to.

In the usual practice referred to it was impossible to run the wire athigh speeds since the action of centrifugal force to force the watercarried by the smooth rolls up through the wire because at such speedsthe formation of the sheet upon the wire was delayed and the resultantpaper if run at such speeds would have a mushy character displaying whenheldto the light portions thinner than or all of the tube rolls in thedirection of the travel of the wire at a slower speed than the wire, orat a higher speed than the wire, or a positive revolution of the tuberoll in a direction opposite to the travel of the wire. By the provisionof the foraminous roll may be driven at a much higher rate of speed eventhough the rolls are not positively driven but act as idle rolls sincethe water coming through the wire upon the side of the roll in thedirection of travel of the wire is not supported throughout the surfaceofthe roll but much of the water, passes to the inproduct.

of theforming layer of pulp uponthe wire j is materially. avoided; alsothe water is re'-' moved from the wire with less disturbance, whichrenders possible an earlier formation of the paper, and if desired theuse of a thicker solution of stock upon the wire, which renders possibletheluse of a substantial increase in the speed of travel of the wire,and

at the same time providing an improved By virtue'of the same result itwould be possible to use a shorter wire than has heretofore beennecessary to complete the formation of the paper.

To accomplish the function described, some or all of the tube rolls maybe positively driven. As shown, each third roll is provided with drivinggears. The rolls 20, 21, and 22 are provided with bevel gears 23 in meshwith bevel gears 24, carried by a shaft 25, which shaft may be driven'ineither direction by means not shown. i

To enable the selective operation of the driven rolls, or the idle rolls19, each of the tube rolls shown is indicated as mounted upon anadjustable journal 26, which journals are supported in sockets 27 insupporting bars 28 by meansof thumb screws 29. By manipulation of thescrews 29 the idle rolls-19 may be each lowered out of contact with thewire and the drivenrolls 20, 21, 22, brought into alignment and incontact with the wire, or the idle rolls may be brought into operationand-the driven rolls'may be lowered. If desired for any purpose, bothsets of rolls may be operated at the same time. p

As shown in Fig. 3, means such as described in'my Patent No. 1,623,526,granted April 5, 1927, for removing water from the under side of thewire 10 have been combined with the positively driven rolls abovedemeans for bringing either or both into action at a particular time. Asshown in Fig. 3, the bars for wiping off the water are shown at 30mounted upon adjustable supports 26 which may be raised'or lowered bymeans" of screws 29. Therefore these bars may be used instead of therolls 20, 21, 22, or in com- I .bination therewith.

shown in the present application, the wire The mounting of the bars 30in Fig. 4 is similar to that in Fig. 3 but are alternated with Ordinaryidling tube rolls l9.

A further improvement is shown in Fig, 5. It has been discovered thatanyor all of the tube rolls provide unexpectedly good results .if made withthe surfaces perforated. There is therefore shown in Fig. 5 a roll 31formed hollow and having its surface supplied with numerousIperforations32. When the positively driven rolls 20, 21, 22 are made as shown inFig. 5, and driven so as to have a slippage between the roll and thewire 10,

maximum results in removing the water from.

the under side .of the wire are secured.

The speed at which the wire can be run I with rolls of the usual. smoothsurface type acting as idlers in the formatiorf of tissue paper has beenfound to be substantially 300 to 400 feet per minute. By provision offoraminous'rolls of the present invention even when driven at the speedof the wire or caused to run at such speed by friction with the wire andnot positively driven, it is found possible to run the wire ata muchhigher rate of speed, the possible speed depending to some extent uponthe nature of the'paper which is being manufactured.

- Experiments already made seem to indicate that by the means discloseda wire speed of 1000 feet per minute may be attained when makingtis'suepaper. I

Applicant is aware of paten'tto Bradbury No. 715,749 granted December'16, 1902 which was designed to allowwater to drain through v the rollupon the side of the roll which is ap preaching the wire but is notaware fthat this ,,roll was ever used with a wire running at the speedsnow contemplated nor with wire running at aspeed which would introducethe bad efiects of centrifugal action from the sur-' faces ofthe rolls.B use of the invention above described, it is ound possible'to operatethe wire at a substantial increase of speed and at the same time providea superior product. This application is filed as a substitute for and acontinuation in part of my application Serial No. 92,856, filed March 6,1926. Minor changes may be made in the physical embodimentof theinvention without departing from the spirit thereof within the scope ofthe appended claims.

' I claim i a 1. In a Fourdrinier' machine, in combination, a travelingwire, means to deliver pulp wire, and means to positively drive saidtube" I wire,."and means to positively drive at least one-of said tuberolls in a direction and at a speed to increase the relative rateofspeed of travel of the surfaces of the wire and roll..

2. In a Fourdrinier ma'chin'e in combination, a traveling Wire, means todeliver pulp to said wire, tube rolls coacting with said rolls in adirection and at 'aspeed to cause a slippage of the wire over thesurface of the tube rolls.

3. In a Fourdrinier machine, in 'combina tion, a traveling Wire, meansto deliver pulp "to said wire, tube rolls coa'ctingwith said wire, andmeans to positively drive at least one'of said rolls in a directioncounter to that of the'travel of the wire.- I

' 4. In a'Fourdrinier machine, in combination, an idle tube roll, apositively driven tube roll, means to drive the latter to provide aslippage of the wire thereover, and means to selectively'place either ofsaid rolls into operation. v a I 5. In a Fourdrinier machine, incombination, a Fourdrim'er wire,'tube rolls placedbeneath said wire,bars placed beneath said wire adjacent to said tube rolls, andmeans forbringing either or both said bars and said rolls, closely adjacent theunder side of the Wire for removing water therefrom. 6. AFourdrlmer'mac'hlne comprising in combination, a Fourdrinier wire, atube roll closely adj acent'the underside thereof comprising aforaminous shell and means to positively drive said 011 in a directionandat a I rate of speed to provide slippage between the wire and theroll.

7. In a paper machine, a travelling carrier, table rolls for supportingthe same, and

means for driving some of the said table'rolls at a difierent rate oftravel than the rate of travel of said carrier.

In testimony whereof I affix' my signature;

' AUSTIN OOIJRIN. j a

